| australia | new south wales | helminthocladia australis | species | 4 | 0 |
| australia | tasmania | helminthocladia australis | species | 1 | 0 |
| australia | tasmania | helminthocladia sp. 2 gws-2013 | species | 2 | 0 |
| australia | victoria | helminthocladia australis | species | 1 | 0 |
| bermuda | | helminthocladia kempii | species | 1 | 0 |
| france | bretagne region | helminthocladia hudsonii | species | 1 | 0 |
| saint helena | | helminthocladia calvadosii | species | 2 | 0 |
| spain | cantabria | helminthocladia calvadosii | species | 2 | 0 |
| taiwan | | helminthocladia australis | species | 2 | 0 |
| taiwan | taiwan municipality | helminthocladia australis | species | 1 | 0 |
| united states | | helminthocladia rhizoidea | species | 6 | 0 |